Lucy and Desi "make up" by taking off their clothes and kissing passionately before they're interrupted by a radio broadcast. She's seen in a nightgown and he's in his shirt and boxers. No sex or nudity is seen.
Lucy is shown wearing only her bra and underwear while wearing one of Desi's suit jackets left unbuttoned. Later, they're shown having sex. The scene is in a dark bedroom, but it is clear what they are doing.
There is a lot of talk over whether Desi was faithful or not.
There is a small sex scene with some thrusting, but no nudity. Last for less than 30 seconds.